Paper box



Nov. 24, 1936. c CLAFF 2,062,085 PAPER Box Fil ed May 11, 1935 4 Sheets-Sheet 1 l? I g. 40, 3mm

3 CZaflerzael. Claff 392M I I Nov. 24, 1936. c, c F I 2,052,085

PAPER BOX Filed May 11, 1955 4 Sheets-sheaf 2 Clarence L n n u u n u n r c. L. CLAFF Nov. 24, 1936.

PAEER BOX Filed May 11, 1955 4 Sheets-Sheet 5 Nov. 24, 1936.

C.L.CLAFF.

PAPER BOX Filed May 11,1955

4 Sheets-Sheet 4 3nmwwkwlzmencel. LZaff' Patented Nov. 24, 1936 UNITED STATES PATENT OFFICE Application May 11,

5 Claims.

This invention relates to paper boxes and to a new and improved method of producing the same, one of the objects being to provide a box or cover which is strong and durable although 5 made from stock much thinner than that commonly employed in the manufacture of box-es.

It is a further object of the invention to provide a paper box the exposed raw edges of which are so thin as to be practically unnoticeable so as not to present an objectionable appearance.

A still further object is to provide a laminated box formed of two webs of box board thinner than that commonly employed but which, when joined by an interposed layer of adhesive, provide a stronger structure than one made of a single thickness of thicker box board.

A still further object is to provide a box having a novel arrangement of interfitting or interlocking portions at the corners for preventing the end of the box from being torn out easily when subjected to pulling strains.

With the foregoing and other objects in view the invention resides in certain novel details of construction and combinations of parts and in certain new and novel methods of making a box which will be hereinafter more fully described and pointed out in the claims, it being understood that changes may be made therein within the scope of the invention as claimed.

In the accompanying drawings the preferred forms of the invention have been shown.

In said drawings Figure 1 is a plan View of one end portion of the outer blank from which a box or box lid is r, to be formed.

Figure 2 is a top plan view of the inner blank thereof, the same being shown partly edged with reinforcing or kraft tape.

Figure 3 is a plan view shown one end portion of the two blanks superimposed.

Figure 4 is a bottom plan view of the parts shown in Figure 3, a portion of the outer blank being broken away to show the adhesive coating on the bottom of the inner blank.

Figure 5 is a perspective view of one corner portion of a partly completed box utilizing the assembled blanks shown in Figures 3 and 4.

Figure 6 is a vertical section through the end portion of the box showing the positions of the parts following the step succeeding that shown in Figure 5.

Figure '7 is a horizontal section through one corner portion of the completed box..

Figure 8 is a section on line 8-8 Figure '7.

Figure 9 is a section on line 9-9 Figure 7 and 1935, Serial No. 21,022

showing the line l| on which Figure 7 is taken.

Figure 10 is a top plan View of one end portion of the outer blank of a modified structure.

Figure 11 is a top plan view of one end portion of the inner blank of said structure.

Figure 12 is a perspective view showing the said end portions assembled and partly folded in the formation of a modified form of box.

Figure 13 is a horizontal section through one corner portion of the box made from the blanks shown in Figures 10 and 11.

Figure 14 is a top plan View of one end portion of an outer blank used in the formation of an other modified construction.

Figure 15 is a top plan view of one end portion of the inner blank of said modified structure.

Figure 16 is a perspective view of said blanks assembled and partly folded in the formation of the box.

Figure 17 is a horizontal section through one corner portion of a completed box in which are used the blanks used in Figures 14 to 16 incluslve.

The two blanks used in the formation of this box are adapted to be cut from separate webs of thin box board material, these webs being supplied from rolls and being brought together by any suitable mechanism. While the webs are being fed toward each other the outer surface of one web A will have applied to it a coating of paper the side portions of which are folded over and affixed to the side edges of the web so as to produce a finished edge. As the other web B is advanced, its side edges are provided with lengths of kraft tape 2 which straddle and are afiixed to said edges for reinforcing purposes as shown in Figure 2. A coating 3 of adhesive is applied to the inner surface of the web A and another coating of adhesive 4 is applied to the outer surface of the other web B so that when these two webs are brought together the two coatings of adhesive will come together and produce a laminated web formed of two thicknesses of thin paper board and interposed thicknesses of adhesive.

In the structure illustrated in Figures 1 to 9 inclusive the webs are creased and out before they are assembled so as to produce blanks of the proper shapes for forming the box to be made. The web A, for example, is creased longitudinally and transversely along lines indicated at 5, 6 and 1 respectively so as to divide side walls 8 from the main body portion 9 of the. blank, and to divide end folds ID from the body portion 9. As only one end portion of the blank has been shown in Figure 1 it is to be understood that the opposite end portion is to be a duplicate of that which has been illustrated. Each end told I!) is adapted to be bent along the crease 1. extending longitudinally thereof. Each crease 6 extends across the creases 5 so asto divide the side walls 8 of the blank from end flaps each of which is of a length equal to the length of fold In. Each flap H is reduced in width along a curved edge |2 merging into a straight edge |3 so that a clearance I4 is thus produced between the flap and the adjacent side ofthe fold ID, the inner end of this clearance being tapered due to the curvature of the edge at l2.

The other web B is also divided into blanks which are of the same length as those out from the web A. The two ends of each blank formed from web B are duplicates but inthe drawings only one of these ends hasbeen shown. Each blank is provided with longitudinal creases 5 dividing the body portion IE of the blank" from the side walls I]. Eachblank is also provided with transverse creases I8 each of which. divides the body portion |6.-from an end fold I9. This crease l8 extends across the creases l6 so as to divide the end wallsv H from flaps 20 each of which is of a length equal to the length of fold |9.

Each fold H! has recesses 2| extending toward each other from opposite sides, the area of each of these recesses being substantially the same in size and area as the flap The outer end portions of each fold H] are spaced from the flaps 20 so as to leave clearances 22. In other words the outer portion of the fold I9 is shorter than that portion extending along the crease Hi. This outer portion of the fold, which extends between the. recesses 2| and the end of theblank, is divided from the remainder. of the outer fold by a transverse. crease 23 along which the fold is adapted to be bent as hereinafter explained.

It is to be understood that the distance between the creases I5 is substantially equal to the distance between the creases 5 and that the width of each reinforcedwall IT is substantially equal to the distance between a crease 5.and the edge of the paper Thus when two blanks shaped as herein described are brought together and placed in, superposed relation as in Figure 1 the fold. l9 will be affixed to the fold In and the flaps 2|] willbe aflixed to the flaps all of which has been clearly illustrated in Figure 3. The paper covered edges of the walls 8 and flaps II will be folded over the reinforced edges of the side walls I! and flaps 20. after the two blanks have been joined so that the walls will thus be given well finished edges whenthe box is completed.

Following the joining of the two blanks the joined flaps are bent at right angles to the walls of the blanks and said walls are bent along the creases 5 and I5 into positions perpendicular to the body portions of the blanks. Thus the joined flaps willv be brought into upstanding positions above the creases 6 andl8. Thereafter the joined flaps l0 and I9 are bent upwardly along the creases 6. and I8 so that the flaps II will be receivedwithin the recesses 2| and following this procedure the outer portions of the two flaps are folded inwardly along the creases and 23 so that the glued surface adjacent the ends of the outer portion of flap ID will become affixed to those exposed inner surfaces of the flaps 20 exposed beyond the ends of the fold 9.

If desired an adhesive coating can be placed on all exposed portions of fold |9.between the free edge thereof and the crease 23although as before stated the adhesive exposed beyond the ends of this fold will serve to hold the fold in its final position shown in Figures '7, 8 and 9.

It will be noted that when the blanks are shaped and joined as described the only raw edges exposed at the ends of the box are those formed by the single outer thickness of the thin fold In, the side edges of which will be exposed between the creases 6 and 1. However as this material is quite thin the raw edges will be inconspicuous and not objectionable. The interfitting parts of the blanks due to the provision of the flaps II and the recesses 2| materially strengthen the finished box at the corner portions so that it: will not be pulled apart readily when subjected to strains.

Instead of providing blanks having the interlocking; featureproduced by the recesses 2| and the flaps II, the blanks can be made as shown in Figures 10 and 11 wherein the body portion 24 of the outer blank is separated by longitudinal creases 25-from side walls 26. A transverse crease 21 separates the body portion from an end fold 28 adapted to be folded upon itself along a transverse crease 29; Crease 21 also crosses the creases 25 so as to divide the end walls 26'from short flaps 30.

The other blank of which this modified form of box is to be made includes a body portion 3| separated by side creases 32 from side walls 33. A transverse crease 34=separates the body portion 3| from an end fold 35 divided by a transverse crease 36. This end fold is. of less width than the body portion 3| and terminates inwardly from the lines of the creases 32 so as to-leave clearances 37 between the ends of the fold 35and flaps 38which extend from the sidewalls 33. These flaps 38 are divided from the walls 33. by transverse creases 39.

The blank shown in Figure 10 can be provided with a paper covering 40 such as heretofore indicated at and the blank shown in Figure 11 can be reinforced at its edges with kraft tape 4| as described in connection with Figures 1 to 9 inclusive. One surface of each blank has a coating ofadhesive 42, these adhesive coatings being adapted to come together when the two blanks are placed in superposed relation with the fold 35' resting on and centered upon the fold 28. After the two blanks have thus. beenassembled the flaps 38 and 30 are bent perpendicularly to their walls 33 and 26 relatively and said walls are then bent perpendicularly to the body portions of the blanks so that thev joined flaps willupstand from the creases 34 and 21. Folds 28. and 35 are thenbent over these flaps so as to straddle them and be affixed thereto.

It is to be understood of course that both ends of each blank are to be duplicates.

In this modified construction the only raw edges exposed at the'outside of the completed box are the side edges of those portions of the folds 28 located between the creases 2T and 29. As the outer blank is of thin box board; the edges thus exposed will be barely noticeable and will not mar the appearance of the finished box.

Instead of providing flaps 30 which are relatively short and which enable the corner portions of the box to be materially reduced in thickness; the side walls 43'and 44 of the respective blanks can be provided with flaps 45 and'flieach of which is of the same length as the end fold's 41 and 48. Folds 48 are of less width than the fold 41 so that after the blanks have been assembledand folded the only raw edges'exposed'will be those formed by the sides of fold 41 between its creases 49 and 5D. In this modified form of box the end wall is more bulky than in the form shown in Figures 10 to 13 inclusive but nevertheless the raw edges are still barely noticeable because of the thinness of the material due to the reduction in thickness of the end walls at the sides.

Importance is attached to the fact that in each of the structures described, except that shown in Figures 14 to 17 inclusive the outer surface of each end wall is flat from one exposed raw edge to the other. This is due entirely to the interfitting formation of the end folds I0 and I9 and the corner wings which are made up of the afiixed flaps l l and 20 in the structure shown in Figures 1 to 9 inclusive. In the structure shown in Figures 10 to 13 inclusive the flat outer surface is due to the stepped formation of the corner wings formed by the affixed flaps 30 and 38, these stepped wings interfitting with the folds 28 and 35, one layer of the fold 35 lying in the same plane with the flaps 30 while one thickness only of the fold 28 laps the flaps 30 as clearly shown in Figures 12 and 13. While the box herein described is illustrated and referred to as having a coating l of paper, it is to be understood that any suitable coating material canbe used in lieu of paper.

The term box as herein used is intended to apply either to the body portion of a box or to a cover for a box.

What is claimed is:

1. A paper box comprising inner and outer layers of boxboard material aflixed to form a laminated structure, a layer of coating material applied to the outer surface of the outer layer, each layer having side walls with end flaps, and also having end folds, the fold of the inner layer terminating at its sides inwardly from the sides of the folds of the outer blank layer and the coating material being coextensive in length and width with the folds of the outer layer, the corresponding fiaps of the inner and outer layers being affixed to form corner wings, and said wings being extended toward each other, one flap of each wing being smaller than the other, said folds being astride and afiixed to the wings, a portion of the fold of the inner layer being positioned in the same plane with the smaller flaps of the Wings whereby portions of the raw side edges of the fold of the outer layer and the coating material only are exposed outside the box.

2. A paper box comprising inner and outer layers of sheet material affixed to form a laminated structure, each layer having side walls with end flaps, and also having end folds, the fold of the inner layer terminating at its sides inwardly from the sides of the folds of the outer layer, the corresponding flaps of the two layers being affixed to form corner wings, and said wings being extended toward each other, one flap of each wing being narrower than the other to provide a clearance thereunder, said folds being astride and affixed to the wings, portions of the fold of the inner layer being recessed to receive the narrow flaps, thereby to lie in the same plane therewith, the raw edges of a portion of the fold of the outer layer only being exposed outside the box and said portion being affixed to and flat upon the interfitting portion of the narrow flaps and the fold of the inner layer.

3. A paper box formed of affixed layers of box board forming a laminated blank having stepped corner wings, and a fold formed by the end of the laminated blank, said fold straddling and affixed to the wings to substantially conceal the inner and outer surfaces thereof and being stepped at its sides to interfit the stepped Wings whereby the raw side. edges of one layer only of the blank are exposed outside the box.

4. A paper box formed of aflixed layers of box board forming a laminated blank having stepped corner wings, and a fold formed by the end of the laminated blank, said folcl straddling and affixed to the wings and being stepped at its sides to interfit the stepped wings whereby one layer of the fold is positioned in the same plane with one layer of each wing and the raw side edges of the other layer only of the fold are exposed outside the box.

5. A paper box formed of affixed layers of box board forming a laminated blank having corner wings, and a fold formed by the end of the laminated blank, said fold straddling and aflixed to the. wings and being stepped at its sides whereby one layer of the fold is interfitted with and positioned in the same plane with one layer of each wing and the raw side edges of the outer layer only of the fold are exposed outside the box.

CLARENCE LLOYD CLAFF. 

